Compilare: main.cpp: In function 'void que()': main.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[nod].size(); i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void back()': main.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[2*n+1].size(); i++){ ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:97:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sol.size(); i++) ~~^~~~~~~~~~~~